<?php
/**
 * 分页类
 *
 * show(2)  1 ... 62 63 64 65 66 67 68 ... 150
 * 分页样式
 * #page{font:12px/16px arial}
 * #page span{float:left;margin:0px 3px;}
 * #page a{float:left;margin:0 3px;border:1px solid #ddd;padding:3px 7px; text-decoration:none;color:#666}
 * #page a.now_page,
 * #page a:hover{color:#fff;background:#05c}
 */

class Page
{
	public     $first_row;        //起始行数

	public     $list_rows;        //列表每页显示行数

	protected  $total_pages;      //总页数
	protected  $total_rows;       //总行数
	protected  $now_page;         //当前页数
	protected  $method  = 'defalut'; //处理情况 Ajax分页 Html分页(静态化时) 普通get方式
	protected  $parameter = '';
	protected  $page_name;        //分页参数的名称
	protected  $ajax_func_name;
	protected  $paramArr_= array();
	public     $plus = 3;         //分页偏移量
	protected  $url;
	/**
	 * 构造函数
	 * @param unknown_type $data
	 */
	public function __construct($data = array())
	{
		$this->total_rows = $data['total_rows'];
		$this->parameter         = !empty($data['parameter']) ? $data['parameter'] : '';
		$this->list_rows         = !empty($data['list_rows']) && $data['list_rows'] <= 100 ? $data['list_rows'] : 15;
		$this->total_pages       = ceil($this->total_rows / $this->list_rows);
		$this->page_name         = !empty($data['page_name']) ? $data['page_name'] : 'p';
		$this->ajax_func_name    = !empty($data['ajax_func_name']) ? $data['ajax_func_name'] : '';
		$this->method           = !empty($data['method']) ? $data['method'] : '';
		/* 当前页面 */
		if(!empty($data['now_page']))
		{
			$this->now_page = intval($data['now_page']);
		}else{
			$this->now_page   = !empty($_GET[$this->page_name]) ? intval($_GET[$this->page_name]):1;
		}
		$this->now_page   = $this->now_page <= 0 ? 1 : $this->now_page;
		if(!empty($this->total_pages) && $this->now_page > $this->total_pages)
		{
			$this->now_page = $this->total_pages;
		}
		$this->first_row = $this->list_rows * ($this->now_page - 1);
	}

	/**
	 * 得到当前连接
	 * @param $page
	 * @param $text
	 * @return string
	 */
	protected function _get_link($page,$text)
	{
		switch ($this->method) {
			case 'ajax':
				$parameter = '';
				if($this->parameter)
				{
					$parameter = ','.$this->parameter;
				}
				return '<a onclick="' . $this->ajax_func_name . '(\'' . $page . '\''.$parameter.')" href="javascript:void(0)">' . $text . '</a>' . "\n";
				break;
					
			case 'html':
				$url = str_replace('?', $page,$this->parameter);
				return '<a href="' .$url . '">' . $text . '</a>' . "\n";
				break;
			case 'php':
				$url = str_replace('?', $page,$this->parameter);
				return '<a href="' .$url . '?p='.$this->parseText($text).$this->set_parse_param($this->paramArr_).'">' . $text . '</a>' . "\n";
				//				return '<a href="' .$url . '">' . $text . '</a>' . "\n";
				break;
					
			default:
				return '<a href="' . $this->_get_url( $page ) . '">' . $text . '</a>' . "\n";
				break;
		}
	}
	//设置 url get参数
	protected function set_parse_param($paramArr)
	{
		$parse = '';$str = '&';
		if(is_array($paramArr))
		{
			foreach ($paramArr as $k=>$v)
				$parse .= $str.$k.'='.$v;
		}
		return $parse;
	}
	public function setParamArr($paramArr)
	{
		$this->paramArr_ = $paramArr;
	}
	protected  function parseText($text)
	{
		switch($text)
		{
			case '第一页':
				return 1;
				break;
			case '最后一页':
				return $this->total_pages;
				break;
			case '上一页':
				return $this->now_page-1;
				break;
			case '下一页':
				return $this->now_page+1;
				break;
			default:
				return $text;
				break;
		}
	}
	/**
	 * 设置当前页面链接
	 */
	protected function _set_url()
	{
		$url  =  $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;
		$parse = parse_url($url);
		if(isset($parse['query'])) {
			parse_str($parse['query'],$params);
			unset($params[$this->page_name]);
			$url   =  $parse['path'].'?'.http_build_query($params);
		}
		if(!empty($params))
		{
			$url .= '&';
		}
		$this->url = $url;
	}

	/**
	 * 得到$page的url
	 * @param $page 页面
	 * @return string
	 */
	protected function _get_url($page)
	{
		if($this->url === NULL)
		{
			$this->_set_url();
		}
		//  $lable = strpos('&', $this->url) === FALSE ? '' : '&';
		return $this->url . $this->page_name . '=' . $page;
	}


	/**
	 * 得到第一页
	 * @return string
	 */
	public function first_page($name = '第一页')
	{
		if($this->now_page > 5)
		{
			return $this->_get_link('1', $name);
		}
		return '';
	}

	/**
	 * 最后一页
	 * @param $name
	 * @return string
	 */
	public function last_page($name = '最后一页')
	{
		if($this->now_page < $this->total_pages - 5)
		{
			return $this->_get_link($this->total_pages, $name);
		}
		return '';
	}

	/**
	 * 上一页
	 * @return string
	 */
	public function up_page($name = '上一页')
	{
		if($this->now_page != 1)
		{
			return $this->_get_link($this->now_page - 1, $name);
		}
		return '';
	}

	/**
	 * 下一页
	 * @return string
	 */
	public function down_page($name = '下一页')
	{
		if($this->now_page < $this->total_pages)
		{
			return $this->_get_link($this->now_page + 1, $name);
		}
		return '';
	}
	/**
	 * 分页样式输出
	 * @param $param
	 * @return string
	 */
	public function show($param = 1)
	{
		if($this->total_rows < 1)
		{
			return '';
		}
			
		$className = 'show_' . $param;
			
		$classNames = get_class_methods($this);

		if(in_array($className, $classNames))
		{
			return $this->$className();
		}
		return '';
	}
	protected function show_1()
	{
		$plus = $this->plus;
		if( $plus + $this->now_page > $this->total_pages)
		{
			$begin = $this->total_pages - $plus * 2;
		}else{
			$begin = $this->now_page - $plus;
		}
			
		$begin = ($begin >= 1) ? $begin : 1;
		$return = '';
		$return .= $this->first_page();
		$return .= $this->up_page();
		for ($i = $begin; $i <= $begin + $plus * 2;$i++)
		{
			if($i>$this->total_pages)
			{
				break;
			}
			if($i == $this->now_page)
			{
				$return .= "<a class='now_page'>$i</a>\n";
			}
			else
			{
				$return .= $this->_get_link($i, $i) . "\n";
			}
		}
		$return .= $this->down_page();
		$return .= $this->last_page();
		return $return;
	}
	
	protected function show_2()
	{
		if($this->total_pages != 1)
		{
			$return = '';
			$return .= $this->up_page('<');
			for($i = 1;$i<=$this->total_pages;$i++)
			{
				if($i == $this->now_page)
				{
					$return .= "<a class='now_page'>$i</a>\n";
				}
				else
				{
					if($this->now_page-$i>=4 && $i != 1)
					{
						$return .="<span class='pageMore'>...</span>\n";
						$i = $this->now_page-3;
					}
					else
					{
						if($i >= $this->now_page+5 && $i != $this->total_pages)
						{
							$return .="<span>...</span>\n";
							$i = $this->total_pages;
						}
						$return .= $this->_get_link($i, $i) . "\n";
					}
				}
			}
			$return .= $this->down_page('>');
			return $return;
		}
	}


	protected function show_3()
	{
		$plus = $this->plus;
		if( $plus + $this->now_page > $this->total_pages)
		{
			$begin = $this->total_pages - $plus * 2;
		}else{
			$begin = $this->now_page - $plus;
		}
		$begin = ($begin >= 1) ? $begin : 1;
		$return = '总计 ' .$this->total_rows. ' 个记录分为 ' .$this->total_pages. ' 页, 当前第 ' . $this->now_page . ' 页 ';
		$return .= ',每页 ';
		$return .= '<input type="text" value="'.$this->list_rows.'" id="pageSize" size="3"> ';
		$return .= $this->first_page()."\n";
		$return .= $this->up_page()."\n";
		$return .= $this->down_page()."\n";
		$return .= $this->last_page()."\n";
		$return .= '<select onchange="'.$this->ajax_func_name.'(this.value)" id="gotoPage">';

		for ($i = $begin;$i<=$begin+10;$i++)
		{
			if($i>$this->total_pages)
			{
				break;
			}
			if($i == $this->now_page)
			{
				$return .= '<option selected="true" value="'.$i.'">'.$i.'</option>';
			}
			else
			{
				$return .= '<option value="' .$i. '">' .$i. '</option>';
			}
		}
		$return .= '</select>';
		return $return;
	}
}

